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synced 2024-08-06 08:53:48 +00:00
Fix virDomainObj ref handling in QEMU driver
Since the monitor I/O is processed out of band from the main thread(s) invoking monitor commands, the virDomainObj may be deleted by the I/O thread. The qemuDomainObjBeginJob takes an extra reference to protect against final deletion, but this reference is released by the corresponding EndJob call. THus after the EndJob call it may not be valid to reference the virDomainObj any more. To allow callers to detect this, the EndJob call is changed to return the remaining reference count. * src/conf/domain_conf.c: Make virDomainObjUnref return the remaining reference count * src/qemu/qemu_driver.c: Avoid referencing virDomainObjPtr after qemuDomainObjEndJob if it has been deleted.
This commit is contained in:
Daniel P. Berrange
parent
604c70fd5d
commit
8e7d14953c
@ -231,7 +231,7 @@ static void virDomainObjListDeallocator(void *payload, const char *name ATTRIBUT
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{
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virDomainObjPtr obj = payload;
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virDomainObjLock(obj);
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if (!virDomainObjUnref(obj))
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if (virDomainObjUnref(obj) > 0)
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virDomainObjUnlock(obj);
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}
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@ -637,9 +637,9 @@ int virDomainObjUnref(virDomainObjPtr dom)
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if (dom->refs == 0) {
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virDomainObjUnlock(dom);
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virDomainObjFree(dom);
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return 1;
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return 0;
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}
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return 0;
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return dom->refs;
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}
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static virDomainObjPtr virDomainObjNew(virConnectPtr conn,
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@ -371,15 +371,18 @@ static int qemuDomainObjBeginJobWithDriver(struct qemud_driver *driver,
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*
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* To be called after completing the work associated with the
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* earlier qemuDomainBeginJob() call
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*
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* Returns remaining refcount on 'obj', maybe 0 to indicated it
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* was deleted
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*/
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static void qemuDomainObjEndJob(virDomainObjPtr obj)
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static int ATTRIBUTE_RETURN_CHECK qemuDomainObjEndJob(virDomainObjPtr obj)
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{
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qemuDomainObjPrivatePtr priv = obj->privateData;
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priv->jobActive = 0;
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virCondSignal(&priv->jobCond);
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virDomainObjUnref(obj);
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return virDomainObjUnref(obj);
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}
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@ -3039,9 +3042,9 @@ static virDomainPtr qemudDomainCreate(virConnectPtr conn, const char *xml,
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goto cleanup; /* XXXX free the 'vm' we created ? */
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if (qemudStartVMDaemon(conn, driver, vm, NULL, -1) < 0) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains,
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vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains,
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vm);
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vm = NULL;
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goto endjob;
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}
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@ -3054,8 +3057,9 @@ static virDomainPtr qemudDomainCreate(virConnectPtr conn, const char *xml,
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if (dom) dom->id = vm->def->id;
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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virDomainDefFree(def);
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@ -3110,7 +3114,8 @@ static int qemudDomainSuspend(virDomainPtr dom) {
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ret = 0;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -3169,7 +3174,8 @@ static int qemudDomainResume(virDomainPtr dom) {
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ret = 0;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -3213,7 +3219,8 @@ static int qemudDomainShutdown(virDomainPtr dom) {
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qemuDomainObjExitMonitor(vm);
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -3252,16 +3259,17 @@ static int qemudDomainDestroy(virDomainPtr dom) {
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VIR_DOMAIN_EVENT_STOPPED,
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VIR_DOMAIN_EVENT_STOPPED_DESTROYED);
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if (!vm->persistent) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains,
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vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains,
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vm);
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vm = NULL;
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}
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ret = 0;
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -3402,7 +3410,8 @@ static int qemudDomainSetMemory(virDomainPtr dom, unsigned long newmem) {
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ret = 0;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -3452,7 +3461,8 @@ static int qemudDomainGetInfo(virDomainPtr dom,
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err = qemuMonitorGetBalloonInfo(priv->mon, &balloon);
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qemuDomainObjExitMonitor(vm);
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if (err < 0) {
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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goto cleanup;
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}
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@ -3462,7 +3472,10 @@ static int qemudDomainGetInfo(virDomainPtr dom,
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else
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info->memory = balloon;
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0) {
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vm = NULL;
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goto cleanup;
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}
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} else {
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info->memory = vm->def->memory;
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}
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@ -3671,15 +3684,16 @@ static int qemudDomainSave(virDomainPtr dom,
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VIR_DOMAIN_EVENT_STOPPED,
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VIR_DOMAIN_EVENT_STOPPED_SAVED);
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if (!vm->persistent) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains,
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vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains,
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vm);
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vm = NULL;
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}
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (fd != -1)
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@ -3766,7 +3780,8 @@ static int qemudDomainCoreDump(virDomainPtr dom,
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}
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -3827,7 +3842,8 @@ static int qemudDomainSetVcpus(virDomainPtr dom, unsigned int nvcpus) {
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ret = 0;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -4235,9 +4251,9 @@ static int qemudDomainRestore(virConnectPtr conn,
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fd = -1;
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if (ret < 0) {
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if (!vm->persistent) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains,
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vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains,
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vm);
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vm = NULL;
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}
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goto endjob;
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@ -4265,8 +4281,9 @@ static int qemudDomainRestore(virConnectPtr conn,
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ret = 0;
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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virDomainDefFree(def);
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@ -4314,7 +4331,10 @@ static char *qemudDomainDumpXML(virDomainPtr dom,
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qemuDomainObjEnterMonitor(vm);
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err = qemuMonitorGetBalloonInfo(priv->mon, &balloon);
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qemuDomainObjExitMonitor(vm);
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0) {
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vm = NULL;
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goto cleanup;
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}
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if (err < 0)
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goto cleanup;
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if (err > 0)
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@ -4547,7 +4567,8 @@ static int qemudDomainStart(virDomainPtr dom) {
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VIR_DOMAIN_EVENT_STARTED_BOOTED);
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -5338,7 +5359,8 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
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ret = -1;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (cgroup)
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@ -5672,7 +5694,8 @@ static int qemudDomainDetachDevice(virDomainPtr dom,
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ret = -1;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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virDomainDeviceDefFree(dev);
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@ -5996,7 +6019,8 @@ qemudDomainBlockStats (virDomainPtr dom,
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qemuDomainObjExitMonitor(vm);
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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VIR_FREE(qemu_dev_name);
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@ -6214,7 +6238,8 @@ qemudDomainMemoryPeek (virDomainPtr dom,
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ret = 0;
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endjob:
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qemuDomainObjEndJob(vm);
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if (qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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VIR_FREE(tmp);
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@ -6708,8 +6733,8 @@ qemudDomainMigratePrepareTunnel(virConnectPtr dconn,
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if (qemust == NULL) {
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qemudShutdownVMDaemon(NULL, driver, vm);
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if (!vm->persistent) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains, vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains, vm);
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vm = NULL;
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}
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virReportSystemError(dconn, errno,
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@ -6727,8 +6752,9 @@ qemudDomainMigratePrepareTunnel(virConnectPtr dconn,
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ret = 0;
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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virDomainDefFree(def);
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@ -6895,8 +6921,8 @@ qemudDomainMigratePrepare2 (virConnectPtr dconn,
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* should have already done that.
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*/
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if (!vm->persistent) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains, vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains, vm);
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vm = NULL;
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}
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goto endjob;
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@ -6908,8 +6934,9 @@ qemudDomainMigratePrepare2 (virConnectPtr dconn,
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ret = 0;
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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virDomainDefFree(def);
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@ -7399,8 +7426,8 @@ qemudDomainMigratePerform (virDomainPtr dom,
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VIR_DOMAIN_EVENT_STOPPED_MIGRATED);
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if (!vm->persistent || (flags & VIR_MIGRATE_UNDEFINE_SOURCE)) {
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virDomainDeleteConfig(dom->conn, driver->configDir, driver->autostartDir, vm);
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains, vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains, vm);
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vm = NULL;
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}
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ret = 0;
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@ -7424,8 +7451,9 @@ endjob:
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VIR_DOMAIN_EVENT_RESUMED,
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VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
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}
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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@ -7523,15 +7551,16 @@ qemudDomainMigrateFinish2 (virConnectPtr dconn,
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VIR_DOMAIN_EVENT_STOPPED,
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VIR_DOMAIN_EVENT_STOPPED_FAILED);
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if (!vm->persistent) {
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qemuDomainObjEndJob(vm);
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virDomainRemoveInactive(&driver->domains, vm);
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if (qemuDomainObjEndJob(vm) > 0)
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virDomainRemoveInactive(&driver->domains, vm);
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vm = NULL;
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}
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}
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endjob:
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if (vm)
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qemuDomainObjEndJob(vm);
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if (vm &&
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qemuDomainObjEndJob(vm) == 0)
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vm = NULL;
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cleanup:
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if (vm)
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